Automatic Oil Muffle Furnace Small 320×157 Medium 640×314 Large 1024×503 Download Tiff Original 2400×1179 | (599.4 KB) Description "A muffle furnace, employed for annealing, hardening, and tempering." —Encyclopedia Britannica, 1910 Keywords anneal, automatic, harden, machine, muffle, oil, temper Galleries Miscellaneous Industrial Machinery Source: The Encyclopedia Britannica: Volume 3 (New York, NY: The Encyclopedia Britannica Company, 1910)
